The protest rally took place to express anger a day after Trump took the oath of office.
The march on Washington have reportedly attracted a quarter of a million people on Saturday. The march is predicted to become one of the largest political demonstrations ever seen in the US capital.
The angry demonstrators went to Washington on their own, using buses and trains from distant locations.
The latest march seeks to raise awareness of women's rights and other civil rights.
Many Americans fear rights could be under threat by the new president.
Trump angered many at home and abroad during his bombastic presidential campaign. He has repeatedly made disparaging remarks about women, Muslims and immigrants.
Alongside with the Women’s March on Washington, hundreds of marches and massive rallies have been planned around the United States. Some of the largest rallies are expected to be held in Boston, New York, Chicago and Los Angeles.
Women in more than 30 other countries are set to take to the streets to march against the new president.
Thousands of protesters have taken part in in London as part of an international campaign on the first full day of Trump's presidency.
Massive marches and rallies by women have already taken place in New Zealand, Australia, and Japan.
It is worthy to mention that Imam Khomeini, the late founder of the Islamic Republic raised status of women following the victory of Islamic Revolution in Iran. Women play decisive role in all fields and arenas after Imam established Islamic-democratic system in Iran.
Imam Khomeini had also been considered as champion of rights of followers of all divine religions and minorities in contemporary history.